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Can anyone tell me how wide I can go with the stock 20 inch rime on rear of my 2019 RT?
Currently I have 245/45R20. Can I put 305/35R20 on same rim and is there enough room in wheel well?
 

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Your R/T probably has 8-inch wide wheels. The maximum width tire that will wear and perform properly on it is a 245/45-20. 305/35-20 tires would require an 11-inch rim with the proper offset.

The new widebody Challengers, besides have larger wheels, have fender flairs to accomodate the extra width.

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Max you can go on an 8 inch wheel would be 255/45R20 . .4 taller than the 245's and .3 wider . not a big difference but if you shop different brands you will find some that are wider . Continental DSW06 specs show wider tread than other brands. I have Michelin Pilot Sport A/S 3+ in 255 on my DD Charger R/T with OE 8 inch wheels.
 

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I had, well have 275's on my 20X8 wheels without any issues however I am selling those as is, because I wanted more in the back as well and had to get new rims to get it. Was running 20x8 with 275's all around link to those: 20x8by275 now I am running 275's on 20x9.5 and 315's on 20x10.5. It has been done and Discount tire mounted all mine without issue.

-Dogg
 

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OP if you do decided to run a different size tire you can use AlfaOBD (software that is free for 15 min. intervals that is used with a OBD dongle) to program the new size into your BCM. 255/45 won't give much error (tires are ~1% difference in diameter compared to stock) in speedo reading.
 

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Can anyone tell me how wide I can go with the stock 20 inch rime on rear of my 2019 RT?
Currently I have 245/45R20. Can I put 305/35R20 on same rim and is there enough room in wheel well?
Is this for the rear end breaking loose/fish tailing problem?
I am also curious about this. Does this mean you MUST switch from stock wheels to aftermarket wheels?
 

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If you have 8" wide wheels you won't gain much in terms of tire width. I run aftermarket wheels and have Nitto 555 315 wide on my rears and it slightly improved traction...still pretty easy to break them loose. However, I drop the pressure and heat them up with line loc, hook-up is greatly improved. IMO what you really gain with wider tires in the rear is a much better (more muscle) look which is worth it.
 

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So there is no need for the widebody option if you want to go up to 315 in the rear? I know I want to at least get the 275 tires with the 9.5 wheel, which looks to be standard on the T/A, 1320 and brass monkey packages. I thought they came with the dynamics package too, but the build site is showing 245's at the moment. I'm thinking its another glitch in the system.
 

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On a +2015 (not sure about pre-2015) you can run 315s if you have the right wheel. For example, a 10.5" wide wheel with +22mm offset works...no rubbing. I forgot the offset that works with 11" wide rims.
 

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On a +2015 (not sure about pre-2015) you can run 315s if you have the right wheel. For example, a 10.5" wide wheel with +22mm offset works...no rubbing. I forgot the offset that works with 11" wide rims.
So then you MUST switch to aftermarket wheels when you go to a wider tire on the Challenger ScatPack.
The type of driving and usage will be for commuting or pleasure driving. Not drag racing or track use. Occasional passes when needed on freeway highly possible or passing on two lane roads.
 
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